320N: Toy Store With Trains

I am looking for a children’s book about an old man who had a toy store. It may have been toy trains. They had pneumatic tubes. I remember a picture in the book where the man and a young boy are looking through a big window at a miniature city of toy trains. My guess on publication date is the 1970’s.  I've thought a lot about it and maybe the old man was a banker.

 

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